"Life on the Mississippi", by Mark Twain

 Rank  Occurances  Percentage    2-tuple
       (of 137786)
   1       1181    0.8571263%    of the
   2        730    0.5298071%    in the
   3        386    0.2801446%    it was
   4        384    0.2786930%    and the
   5        379    0.2750642%    to the
   6        315    0.2286154%    on the
   7        297    0.2155517%    NUMBER NUMBER
   8        282    0.2046652%    the river
   9        270    0.1959560%    it is
  10        244    0.1770862%    was a
  11        229    0.1661998%    to be
  12        229    0.1661998%    he was
  13        216    0.1567648%    in a
  14        214    0.1553133%    of a
  15        213    0.1545875%    i was
  16        188    0.1364435%    from the
  17        188    0.1364435%    at the
  18        187    0.1357177%    of it
  19        187    0.1357177%    i had
  20        185    0.1342662%    for the
  21        177    0.1284601%    with the
  22        173    0.1255570%    out of
  23        162    0.1175736%    with a
  24        160    0.1161221%    is a
  25        160    0.1161221%    all the
  26        156    0.1132190%    by the
  27        154    0.1117675%    that the
  28        144    0.1045099%    and i
  29        144    0.1045099%    and a
  30        141    0.1023326%    one of
  31        135    0.0979780%    had been
  32        134    0.0972523%    new orleans
  33        128    0.0928977%    there was
  34        123    0.0892689%    he had
  35        117    0.0849143%    and then
  36        116    0.0841885%    for a
  37        114    0.0827370%    was the
  38        112    0.0812855%    into the
  39        109    0.0791082%    the same
  40        103    0.0747536%    the mississippi
  41        101    0.0733021%    on a
  42        100    0.0725763%    the water
  43         98    0.0711248%    to me
  44         98    0.0711248%    the other
  45         96    0.0696733%    there is
  46         96    0.0696733%    in his
  47         95    0.0689475%    the boat
  48         95    0.0689475%    that i
  49         95    0.0689475%    of his
  50         94    0.0682217%    was not
  51         94    0.0682217%    but the
  52         91    0.0660444%    they were
  53         90    0.0653187%    did not
  54         89    0.0645929%    it and
  55         88    0.0638672%    but i
  56         87    0.0631414%    when i
  57         87    0.0631414%    have been
  58         86    0.0624156%    when the
  59         84    0.0609641%    i have
  60         83    0.0602383%    used to
  61         83    0.0602383%    is the
  62         81    0.0587868%    of them
  63         81    0.0587868%    and he
  64         80    0.0580611%    to get
  65         79    0.0573353%    that he
  66         79    0.0573353%    i could
  67         77    0.0558838%    up and
  68         76    0.0551580%    the first
  69         76    0.0551580%    in my
  70         75    0.0544322%    through the
  71         75    0.0544322%    had a
  72         74    0.0537065%    would be
  73         74    0.0537065%    the old
  74         74    0.0537065%    as the
  75         72    0.0522549%    began to
  76         71    0.0515292%    going to
  77         70    0.0508034%    to a
  78         70    0.0508034%    the head
  79         69    0.0500777%    up the
  80         69    0.0500777%    to do
  81         69    0.0500777%    down the
  82         69    0.0500777%    and so
  83         68    0.0493519%    a good
  84         66    0.0479004%    would have
  85         66    0.0479004%    that was
  86         66    0.0479004%    he would
  87         65    0.0471746%    of that
  88         65    0.0471746%    he said
  89         65    0.0471746%    but it
  90         65    0.0471746%    a little
  91         63    0.0457231%    could not
  92         63    0.0457231%    and by
  93         63    0.0457231%    a man
  94         62    0.0449973%    and there
  95         61    0.0442716%    that it
  96         61    0.0442716%    of this
  97         61    0.0442716%    in this
  98         60    0.0435458%    the captain
  99         60    0.0435458%    of course
 100         60    0.0435458%    chapter NUMBER